WASHINGTON — Out-of-staters visiting New York could be allowed to legally carry concealed firearms under a measure up for debate in the Senate today. New York Sen. Charles Schumer, a Democrat, said yesterday he would pull out all the stops to kill the amendment, calling the proposal “simply appalling.”

The legislation, offered by South Dakota Republican John Thune, would allow gun owners to carry their weapons across state lines if they have a valid permit in their home state.